From c410879c7cad36770b2980d2f7a98ea7f34e7139 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment?= <clement@desmidt.fr>
Date: Wed, 23 Dec 2020 14:58:44 +0100
Subject: [PATCH] :construction: Commence le jour 22

---
 day_22/part_1.php | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 day_22/part_1.php

diff --git a/day_22/part_1.php b/day_22/part_1.php
new file mode 100644
index 0000000..ac878d1
--- /dev/null
+++ b/day_22/part_1.php
@@ -0,0 +1,32 @@
+<?php
+
+$players = explode("\n\n", file_get_contents('input.txt'));
+
+[$cards_1, $cards_2] = $players;
+$cards_1 = explode("\n", $cards_1);
+array_shift($cards_1);
+$cards_2 = explode("\n", $cards_2);
+array_shift($cards_2);
+
+while (!empty($cards_1) && !empty($cards_2)) {
+    $card_1 = array_shift($cards_1);
+    $card_2 = array_shift($cards_2);
+    $cards = [$card_1, $card_2];
+    rsort($cards);
+    if ($card_1 > $card_2) {
+        $cards_1 = array_merge($cards_1, $cards);
+    } else {
+        $cards_2 = array_merge($cards_2, $cards);
+    }
+}
+
+$final_deck = empty($cards_1) ? $cards_2 : $cards_1;
+
+$final_deck = array_reverse($final_deck);
+
+$sum = 0;
+for ($i = 1, $l = count($final_deck); $i <= $l; $i++) {
+    $sum += ($i * $final_deck[$i-1]);
+}
+
+echo $sum;
\ No newline at end of file